#write pre{
  position: relative;
  background-color: #f5f5f5;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 10px;
}
pre .btn-pre-copy{
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -khtml-user-select: none;
  user-select: none;
  position: absolute;
  top: 10px;
  right: 12px;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  color: hsla(0,0%,54.9%,.8);
  transition: color .1s;
}